thermoacoustics is the interaction between temperature, density and pressure variations of acoustic waves. thermoacoustic heat engines can readily be driven using solar energy or waste heat and they can be controlled using proportional control.they can use heat available at low temperatures which makes it ideal for heat recovery and low power applications.
a full-body scanner is a device that detects objects on a person's body for security screening purposes, without physically removing clothes or making physical contact. depending on the technology used, the operator may see an alternate-wavelength image of the person's naked body, or merely a cartoon-like representation of the person with an indicator showing where any suspicious items were detected.
in physics, specifically in quantum mechanics, a coherent state is the specific quantum state of the quantum harmonic oscillator, often described as a state which has dynamics most closely resembling the oscillatory behavior of a classical harmonic oscillator. it was the first example of quantum dynamics when erwin schrödinger derived it in .
the effects of a passing gravitational wave, in an extremely exaggerated form, can be visualized by imagining a perfectly flat region of spacetime with a group of motionless test particles lying in a plane, e.g. the surface of a computer screen. as a gravitational wave passes through the particles along a line perpendicular to the plane of the .
an otoacoustic emission oae is a sound that is generated from within the inner ear.having been predicted by austrian astrophysicist thomas gold in 1948, its existence was first demonstrated experimentally by british physicist david kemp in 1978, and otoacoustic emissions have since been shown to arise through a number of different cellular and mechanical causes within the inner ear.
whole body vibration wbv is a generic term used when vibrations mechanical oscillations of any frequency are transferred to the human body. humans are exposed to vibration through a contact surface that is in a mechanical vibrating state. humans are generally exposed to many different forms of vibration in their daily lives.
backscatter x-ray is an advanced x-ray imaging technology. traditional x-ray machines detect hard and soft materials by the variation in x-ray intensity transmitted through the target. in contrast, backscatter x-ray detects the radiation that reflects from the target. it has potential applications where less-destructive examination is required, and can operate even if only one side of the target is available for examination. the technology is one of two types of whole-body imaging technologies t
3d screen technology - one of the more recent advances in oilfield screen technology has brought us the '3d screen', this technology is an innovative method for increasing the screening area of a shale shaker without the need to build larger machines. when seen from the side these screens look like corrugated cardboard, having a flat bottom and .